package org.inspursc.s0517.health.evaluation.utils;

import java.util.Calendar;
import java.util.Date;

public class DateUtil {

    /**
     * 得到几天前的时间
     * @param d
     * @param day
     * @return
     */
    public static Date getDateBefore(Date d, int day){
        Calendar now =Calendar.getInstance();
        now.setTime(d);
        now.set(Calendar.DATE,now.get(Calendar.DATE)-day);
        return now.getTime();
    }

    /**
     * 得到几天后的时间
     * @param d
     * @param day
     * @return
     */
    public static Date getDateAfter(Date d,int day){
        Calendar now =Calendar.getInstance();
        now.setTime(d);
        now.set(Calendar.DATE,now.get(Calendar.DATE)+day);
        return now.getTime();
    }
}
